AISI 1055 Carbon Steel (UNS G10550)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Carbon steels are the steels having carbon as the major alloying element. They also contain up to 1.2% manganese and 0.4% silicon. In addition, the residual elements like copper, molybdenum, aluminium, chromium and nickel are present in these steels.

The following sections will give an overview of AISI 1055 carbon steel in detail.

Chemical Composition

The chemical composition of AISI 1055 carbon steel is outlined in the following table.

Element Content (%)
Iron, Fe 98.41-98.9
Manganese, Mn 0.60-0.90
Carbon, C 0.50-0.60
Sulfur, S ≤ 0.050
Phosphorous, P ≤ 0.040

Physical Properties

The physical properties of AISI 1055 carbon steel are tabulated below.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in3

Mechanical Properties

The following table shows mechanical properties of the cold drawn AISI 1055 carbon steel.

Properties Metric Imperial
Tensile strength, ultimate 660 MPa 95700 psi
Tensile strength, yield 560 MPa 81200 psi
Modulus of elasticity 190-210 GPa 29700-30458 ksi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poissons ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 10% 10%
Reduction of area 40% 40%
Hardness, Brinell 197 197
Hardness, Knoop (converted from Brinell hardness) 219 219
Hardness, Rockwell B (converted from Brinell hardness) 92 92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13 13
Hardness, Vickers (converted from Brinell hardness) 207 207
Machinability (based on AISI 1212 steel. as 100 machinability) 55 55

Thermal Properties

The thermal properties of AISI 1055 carbon steel are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient 11 µm/m°C 6.11 µin/in°F
Thermal conductivity 49.8 W/mK 346 BTU in/hr.ft2.°F

Other Designations

Other designations that are equivalent to AISI 1055 carbon steel include the following:

  • DIN 1.1209
  • ASTM A29
  • ASTM A510
  • ASTM A576
  • ASTM A682
  • FED QQ-S-700 (1055)
  • SAE J403
  • SAE J412
  • SAE J414

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